Surveying the scene with his eyeglasses, Evaro speaks up, "that certainly defies any expectations I may have had about this place. I'd rather head back up to finish exploring the rest of the house before descending down into whatever that is. What do the rest of you think?" If he detect any magic, he will let the party know.

Spoiler: Action!
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Evaro will use the Eyeglasses of Magic Sight to search for unexpected magic auras.